| 학회 |
한국고분자학회 |
| 학술대회 |
2017년 봄 (04/05 ~ 04/07, 대전컨벤션센터) |
| 권호 |
42권 1호 |
| 발표분야 |
고분자가공/복합재료 |
| 제목 |
Morphological Evolution of Block Copolymer Particles: Effect of Solvent Evaporation Rate on Particle Shape and Morphology |
| 초록 |
Shape and morphology of polymeric particles are of great importance in controlling their physical properties or assembly into unusual superstructures. Herein, we report that the evaporation rate of solvent from emulsions encapsulating symmetric polystyrene-b-polybutadiene (PS-b-PB) determines the shape and internal nanostructure of BCP particles. A distinct morphological transition from the ellipsoids with striped lamellae to the onion-like spheres was observed with decreasing evaporation rate. Experiments and dissipative particle dynamics (DPD) simulations showed that the evaporation rate affected the organization of BCPs at the particle surface. Differences in the solvent diffusion rates in PS and PB at rapid evaporation rates induced alignment of lamellae perpendicular to the surface, resulting in ellipsoids. Slower evaporation provided sufficient time for BCP organization into onion with PB as the outermost layer, owing to the preferential interaction of PB with the surrounding. |
| 저자 |
신재만1, 김용주1, 윤홍석1, 이기라2, 김범준1
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| 소속 |
1KAIST, 2성균관대 |
| 키워드 |
Evaporation rate; block copolymer; particle shape; monodisperse
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| E-Mail |
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